48 BEITISH APHIDES. 



apterous male of Aphis padi, and this unusual form of 

 tte male I have since found to obtain in Ghaitopliorus 

 salicivora and other species. In Lachnus quercus it also 

 obtains, so that the wingless condition of the male 

 occurs after all not so very infrequently, and sometimes 

 even when there is also in existence a winged male. 



Throuo-h the kindness of M. Jules Lichtenstein I 

 am enabled here to describe such an apterous male, 

 and to figure in PI. LXIX bis, the viviparous female 

 with her egg. Four specimens were placed between 

 ground watch-glasses and posted to me on the 28th 

 of November from Montpellier, situated almost on the 

 shores of the Mediterranean. The tenacity of life in 

 the fecundated females was well shown by the fact that 

 two eggs were laid by them whilst travelling through 

 the post, and an additional egg was deposited by one 

 of them whilst placed under my microscope on the 3rd 

 of December. The two very diminutive males forwarded 

 to me under the same glasses had succumbed, but they 

 were still in good condition for description. M. Lich- 

 tenstein wrote — " He could send any quantity of sexu- 

 ated lice and their eggs from the quince-tree, Cydonia 

 vulgaris,^^ presumably of the same species.* 



Oviparous female. 



Incli. Millimetres. 



Size of body 0-065x0-040 l-64xl-01. 



Short, oval, almost globose. Head and thorax 

 narrow. Apex of abdomen much swelled out, if a 



* As the existence of males to Aphides has been, as above noted, 

 often doubted, I append De Geer's words as quoted by Kaltenbach : 



" Unter diesen Blattlausen fand ich zwei, deren erne der andern auf 

 dem Riicken sass. Durch die Lupe merkte ich ihre wirkliche Begat- 

 tung, in dem sie beide mit den Hintertheilen zusammenhingen. Um 

 mich abermal davon recht gewiss zu iiberzeugen, beriihrte ich die 

 oberste, die ich fiir das Mannchen hielt. Sie sezte sich gleich in 

 Beweguug, sich loszumachen. Hier sah ich deutlich, das sie einen 

 kleinen hautigen, durchsichtigen Theil aus dem Leibe des Weibchens 

 zog, der auch noch eine Zeitlung aus ihr herausging, hernach aber 

 allmalig wieder zuriickgezogen wurde 



" Die Mannchen dieser Art haben keine Fliigel, wie die Fichten- 

 blattlausmannchen, &c." 



